CVE-2025-55095
CVE-2025-55095 is a medium-severity vulnerability in Eclipse Threadx Usbx with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Medium (CVSS 3.x base score 4.2)
- EPSS exploit prediction: 0% (4th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-206404
- Weakness: CWE-787
- Affected product: Eclipse Threadx Usbx
- Published:
- Last modified:
Description
The function _ux_host_class_storage_media_mount() is responsible for mounting partitions on a USB mass storage device. When it encounters an extended partition entry in the partition table, it recursively calls itself to mount the next logical partition. This recursion occurs in _ux_host_class_storage_partition_read(), which parses up to four partition entries. If an extended partition is found (with type UX_HOST_CLASS_STORAGE_PARTITION_EXTENDED or EXTENDED_LBA_MAPPED), the code invokes: _ux_host_class_storage_media_mount(storage, sector + _ux_utility_long_get(...)); There is no limit on the recursion depth or tracking of visited sectors. As a result, a malicious or malformed disk image can include cyclic or excessively deep chains of extended partitions, causing the function to recurse until stack overflow occurs.
Frequently asked questions
- What is CVE-2025-55095?
- The function _ux_host_class_storage_media_mount() is responsible for mounting partitions on a USB mass storage device. When it encounters an extended partition entry in the partition table, it recursively calls itself to mount the next logical partition. This recursion occurs in _ux_host_class_storage_partition_read(), which parses up to four partition entries. If an extended partition is found (with type UX_HOST_CLASS_STORAGE_PARTITION_EXTENDED or EXTENDED_LBA_MAPPED), the code invokes: _ux_host_class_storage_media_mount(storage, sector + _ux_utility_long_get(...)); There is no limit on the recursion depth or tracking of visited sectors. As a result, a malicious or malformed disk image can include cyclic or excessively deep chains of extended partitions, causing the function to recurse until stack overflow occurs.
- How severe is CVE-2025-55095?
- CVE-2025-55095 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2025-55095 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-55095?
- CVE-2025-55095 affects Eclipse Threadx Usbx. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-55095?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-55095 have an EU (EUVD) identifier?
- Yes. CVE-2025-55095 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206404.
- When was CVE-2025-55095 published?
- CVE-2025-55095 was published on 2026-01-27 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:eclipse:threadx_usbx:*:*:*:*:*:*:*:*
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